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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ec3f905431a0090a9941b4cbe0a9f12f7233afa21e62a29d90619eb3465ecae' 
  AND token = 'PduoiHFzX9tpYUTuxr829axJRTfG8/KFT+ZiE07eqqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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