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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7f8ddc53498f7ccf1c1e8195f4be9faa40de377f1d7253dda05d43dc1a7f688' 
  AND token = 'L4EjyLW5BbRc91b5thkew1v11mWgsQgGrYpLIMgLAiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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