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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9042b4a1c56a0c49125169620c0ba4e2a810db402139ca1045eaba83b4bfbc26' 
  AND token = 'yiagpXx7t1I4Q0Um41gOFZZ7iSLB0WQB3RMXPp52iA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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