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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dab7be4c2617a317b76fc7b13c267b4739b50c861fe49328eb4d081f6d39584' 
  AND token = '1Tp9D2Pbbvtu02AoW+6jTLhLuiEKooxE3BNUHFQY8lQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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