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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8413764d31be9f5a63bb0f3c73651c6b3a02536fcea286cf4af2bf63ab5faac' 
  AND token = 'kfQ2AbATg1FrvSNvGPclSgaEPOhD2WjYiGCd7Zh2J7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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