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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e8a012bf44d2c4488943d8fe3a5e844b11a9d9ed1ccd90abae6c5e1801e0f5b' 
  AND token = 'QNUN/MLYyvorxY6EH1q6BWtPBuUYU0p0f2YKu0n7wIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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