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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b38f4fab50280b18fe9e7af832c6d988d4d1abb1fe293a54268daf758703a244' 
  AND token = 'w3m3YVsCgxe39WfmGsLjsNEnIMlOBmyxt3SLw4il2/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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