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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '696904581da8ab693655206f2f0a59950bf89391f51d9ea45e81e45636cee70a' 
  AND token = 'mk9tLavfcTHjwMXXxABkLqSgQ69HzYr6gKsiR4Khuzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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