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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c545889c009626b2fe73c177a9b62bfe232b9fec8d5848201fe06661e9f9432' 
  AND token = '4aFNrtgv9dfjC3tBJ0daWfmkNZOy4xxr2vxxvMhk1OI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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