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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '661b0f29b3f9379bd9cd1f192141d3fcfa4e7f2039f571388bf1f98598e81812' 
  AND token = 'rEV0l97aDzaPsZOvQChlxDD7rjJ3XO7hKDlzTt2n/SQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}