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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '061fe4a6bb8092cbf1abfe49d33d54fdbd1d620d60c0529321ba0b4e273c48cd' 
  AND token = 'eDwkTXroNrt29qPM8N2DZ04Whr3LoPY9z17XfqHXWjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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