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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad605606b6a8ea405f5718b14d932edd397294c6d10a2e89968562ca8bcf1b86' 
  AND token = 'hay4cwdW48MuD93CFg0jIBs47comRlbWXQU97cTmaoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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