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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fefd9cf2627daaa7d4042dd02bf35c4433201fabca68c741c77143cea53625fe' 
  AND token = '0JOmjbC01AiTMDOsm0vCgj/kNYPyo93lxQFv09aHDLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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