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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9528a8946d75f8d791b6fabf2b850410aa3b6f8ef7a47cba50542c1388933388' 
  AND token = 'hTKo1lfQxfOI5gNcfZm69jMfnbVSEVGX+29awlD5Hqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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