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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5558e665290f6d815e7a5e2253cf8ea20eb27bb39afa9bd4fb507a99e3afe31b' 
  AND token = 'bLtY5IwrzpiYztYMO7I0maq118ljZa0dpv3QINTf7Y8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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