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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46014e41eae1b53b9aad8ca3077d57d52fdfdacca034c26c22d954a69707d870' 
  AND token = 'p5SjCV9rwTn7BOBxcp7uTmN1hbAmfrdox1VsK6Usv8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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