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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c7ca2830cc73441f4f8e8989a3a875fcc6c3be8a9fb1a844e191071b60f5bdb' 
  AND token = 'uPQ4jcIk9AVWM2xwa3tHO0Un/CT7zdT00Htnt09MLao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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