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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a06753566894e0445b35031910cfa11bc3a44418c1dc446abe1640ceafc2b37d' 
  AND token = 'DaMLtSGBtPKdkNP6/ORY+ro589gtvU1jyBbqlVZEBa0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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