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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '799eef2ea728c2ba134b35e4aefd613b4ab1d348b29768c709efe1d1ab7bfe11' 
  AND token = 'oHwejs9KOB2Cur3OEw1hmsS+xZU+zomPKmXcgNe3YKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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