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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c2cc10c339eba6ef3679559fb9cdebc5c02fb45a234887779c2d14f3f2d59c5' 
  AND token = '0eKNp7aGejsWU/ILHyATUl8+i4p5uH/14DUxt1vcGW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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