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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94756cba153de86e19bc7d5a3f0b3d078d760cfda86b9ec59f9d7f6c399963ec' 
  AND token = 'J7lT/QdK4H2AABz2L2zzH0WqwpiXw72/rHqm5kZXnmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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