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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28cb23e1f250ac904abfb470640af8ccb867d0dab616018821763a6f777d5ab0' 
  AND token = 'FiXUWnia9DBCcY+/bpTWT51zp1Ov8miERttmQq3YfLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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