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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8027003a252b48ca5babc3b591f610bfbf540737a5a73ac74db3e9cf138f07b9' 
  AND token = 'aeE+Hds5XeIs2+ZPEAeJzq3eQ/akNYS3r2qfiXkPmCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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