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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '998a229452ac80d89a49f748c29557d4547e7c31fa21efe6d9c524458e7610ba' 
  AND token = 'cUZjM+FRT2fj3X6uU9oBcp+Ph33ykAEOeffuhnrhS9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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