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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '752f3abfd7896c87246ffce597fd1d6fe66e993efea0d667f35e5816b4b19362' 
  AND token = 'uY4WwP0Ch1kgdFi6QmeBSeVtAQ+IL7cPPSn5+jCTnbw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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