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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '356c45f37066504af526d8d11d195b87c59331b75b83ed186f99844d49e1673f' 
  AND token = '0eUmmr70xTXrdhpjuled7Ny4HgIqv/0E9k1z3z4PsJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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