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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3401c5faaab5f970751e76c082d9aba394c42b74a30101022fce73d3e55cd198' 
  AND token = 'NeKBu3rbTI0V+yocU1Q11B1VGKay/bJG4aWohIKG8IE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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