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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca919b738cb7828a1f3da92d6b372e217977e31993141ef55c62466c284512c9' 
  AND token = 'sAH9M+0XUN5gxk9d5J24ghHyT9VOLmI4WpWIyAD5zJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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