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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f855e5c1dcbacfc65663e53d297b1097e375e98585bcac5df1cccf2fcdfb9bd1' 
  AND token = 'wYFss5luaa64SB3BhKk/jn8r57Y8tvvN0XFkJVQYsUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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