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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57370c7fdc7d82d81bf3b74fad5465382cc48d577707f90525222b735f3715e2' 
  AND token = 'vqCXuOcx0rN7WNMTY5ew2puVt2yivpbkVCkqEGVfi2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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