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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1e4fb3cd3b0158c1245566c6885572a3b2b505318b7123165021e0039845d89' 
  AND token = 'Z4nK6LS/Osanlj/GwRAErPy2PXzBokz2DWgsa7DGK+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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