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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5517c38e56f41970a03cb2984834dd35c8aa1e9b26cb7d37ad0824ae1f40837b' 
  AND token = 'u8hQF1qPaTqfAcXceSD4opXhFW003O5FFZj47J2J5Fo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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