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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41f2f54e75a1f4490f7c0fcfc79819de1d602a75cc43192f1f29e4eaca0e6fbb' 
  AND token = '3MJmCR7OaHEcAp2GoGBPHeT5OvYnEVx5BBWGSORUcGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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