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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1712681f3da920aa380687f9497c4ffcf66c81a4bb42a901991a1cf823d9978' 
  AND token = '3/+RVG6FKOP8wUL0R/7xhObC0NKBEpVzazB8WgDN6WE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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