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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cac6771d92da8a3cfdb086b5ebe023717fdd94497c3af3acbbd3359c2884ded' 
  AND token = 'HDaVcE0Faezip5TXFREgQaQAe+jbo7PEdNM8zWWkNH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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