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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d04a028bfd33dffc43d125a53ea3b9950a3c4805a365c31d0172b5807ebdf30' 
  AND token = 'afNy395ZNAau+F7h4lEPMIdDq1A+U0D1DhnmX7JSVlI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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