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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef1464a19c8d88f0e5b763ee56f6f91ec9f62eec320c4609bb4dc13550a0e6b9' 
  AND token = 'yQuTa1/zPx+fxUwvowLyfD8AihjaG1R1fkLCj4X+GUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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