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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '339d6a488318b5a81c681c6d6422bf9effffa6861a4b5b84c728fd6e72a1e24b' 
  AND token = 'zwBimUPtM+BlpGtc+8harwXF1vClFN4Wt4fjTv9EeoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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