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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b25ec0e67e31efd780e9656e2008f83b3e8176adbe5cb90ceec234471d552f7' 
  AND token = 'p5OAq/uCt47mzxcJWw0jg3vJ3YNan0uUDch1KDVVR6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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