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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40cb62f890a61fa65ac037ebd5fbef317994d9530a373b13a4af3deba2e953e6' 
  AND token = 'W5TLQ/ksdVUAJ+LQl4OqePqf7CJ/+J1SjVbZ/Q/WSdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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