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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac3d38a71574a9b21f63b6ac23f8fd920464dd0b200584e3e7addb0518aa215a' 
  AND token = 'Jwyz3IgwR52d2FrSy01/Y8pQHBiRoQu7e3BPBxeos/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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