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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33f71b0727e3ee3d8df5cbfe8a1f1526d495a57c9e161b8c2232272fa7ccfcb4' 
  AND token = 'eErXC7zcxVUCE2y2CDzWmdIb4ahKzrajxWgO+XBUjx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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