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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a9d26d969352a6bd2c9c00238cdc2b7157db5cbe907b18943bf4fc32e644206' 
  AND token = 'PmiP9JvqcihVsox4SQJ/qH5jNJ9pSvOtMhdz23LQ9Cw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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