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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1e2bd038ee21519be92e2be51bc70aa606d6a288c7b1352c67eab7521c1fe34' 
  AND token = 'lrJFV+rCa8KcCETniYzmDtcgfTTbq4VNPTd1d5hzvPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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