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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f13b4372f94bff3252928b8c9cc00c839e55982b14495652419ce40f672217fd' 
  AND token = 've8UmmQJ3Enj99ne8wYVqHs27TOG7Fm8mpWvYpr2HDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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