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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7d6332194c2c6ae5c2a6cd3330fb91c3974bfa07d988ff8f3514e99b1f7c6c7' 
  AND token = 'po5wXGcFqv3WhNldgZFCO9pu8+88y+pyaveVV0m6p9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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