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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efe6165ca081a785cef553a58c5670584bede94beb91050e7550769204ad8aae' 
  AND token = 'amWYpof4l2Muw8e4AkaOup4yP4yndLH+BBMfEt97K0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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