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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cfcaf5e9c1e815aad062e69ee5417eb42c6f22161851b2ccd51d08aa4cd6b38' 
  AND token = 'hfOCrPxPV18hNj2M4GAnjKY/183n7t/rwDY9sFjdrOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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