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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34a222a14c67a5a223999672fb1290ce5bec2bc4fd7a1d792782df9bf89c85a5' 
  AND token = 'vwu7L9yklVn3AmiWhkaHdR8WkdsblqUtAoJqZl9kmO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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